Abstract
The corrosion behavior of recrystallized annealed (RXA) and stress-relieved annealed (SRA) Zircaloy-4 was assessed in 360 ℃ lithiated water for 400 days. SRA Zircaloy-4 with localized corrosion sites below the oxide/metal interface exhibits a much faster out-of-reactor corrosion rate than RXA Zircaloy-4. High-density dislocations can enhance the diffusion of oxygen anions along dislocations, promoting the advancement of corrosive reactions and forming localized corrosion sites. Such a mechanism leads to a less uniform crystallography orientation of monoclinic ZrO2 grains at the oxide/metal interface of SRA Zircaloy-4 compared to its RXA counterpart, resulting in higher compressive stress and oxide cracking rates.
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